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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd978722b2a2df8de21e714c0438971cacbc0eabdaf13bfc79e760794d52d8392' 
  AND token = 'xqgTW66p3uX2v/i8PeUEQKX0Crp0sJm5h1Fvast6ERA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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