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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aea3b4e141923ec7cf3cb54ad08ab20921ad0a868caefcec21c3b9833b7432e' 
  AND token = 'pjc5G5Jg9sE0tFWdcRGl7jW0Qzzl05wgo9CxQfFrako=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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