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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77884c2ea69cf2f74d09abe3118e6fc8ff94a6692f9cfae84fe2d7e16dd7fd8' 
  AND token = 'U5niVgjQZ87lTObqSzV+6d4F1wmh7PhY/kdf1jA1Neg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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