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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990390e0e305238ad6091db09e0179a89f2f4967c6d097410bfd437ed98e6bdd' 
  AND token = 'NZCf0EQ4FNEjSEqjfF0L7n8NRy3w21gKHP/2Fa46roE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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