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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991340702bab5132ddffcd624506008625be06b56ee5dc93c26211221e6607be' 
  AND token = 'lrw6Q758Q5IkV0rHs8/gGBdJItabRsS48UCXI8wen0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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