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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52f413e425b3f6b2a05ffd136db35cd935117733fe3125976c1778c78150a07' 
  AND token = '6uQUft8SW4qpMHoQWhApok7eblHrfic1pUzKBqNVZOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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