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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d837b576bb0e43e327fd14c79437211a5cc4d16929fd6441a4bccb64c9a0076' 
  AND token = '5Q8wWvCcAupDgcB8vz89UGuDqX6Cu9xMo0Efl2Tzk6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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