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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a4068486509f6e70a1585e3ce0c1071304f6c6bb5fa84f89b2e7c9a00b746d' 
  AND token = '0kd2kY8WvCeYOH4PdrTwnPEGHvTRt7p3V5bpg9wI5i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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