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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e013f5b513bc5d15a0b893a5a0e7a986d796393c77f6b24d55c6a30f61ac130a' 
  AND token = 'awyLyqJSPJOXvbm9Us8wMHuumnoOJU6AfKjS2TeGY9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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