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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d2b4d4f54714fbaf95b44a0acec6d946326cd51c884a123b07ef3dc51cf5d3' 
  AND token = '6ba2dVZ7uNxj2Yd3LLbMUAy3jnK6+wealDLUIgRdZXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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