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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a89eba5f9a0935daabad27b4b6a2f0d24e6d63d48f8df70572b7dac90f0eca' 
  AND token = 'Tp3HliXxCF7AO5okXyHGYjGGHNpcNby8QIr3F+Ni2Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}