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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c265d7b20ec8cb69bec399f20b3ba73de4ad594f07afd27011ab6fb359f9e7' 
  AND token = 'rccF2MVA/9/S55X0iWKDt7kvJQ42OkKTn/eT0pk2AUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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