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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da477d9ce71c8c375bf4deff0a7730a849c7d1763f7a8e264635fc8df9d1dd9' 
  AND token = 'O1TFTh+kSJJ9fWyJEIycn+MOB/7B/Xyw6x3ppx52B2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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