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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb695dbb62f45a91c909c6779637e60e027fad18e1245e6559e098a428e4ed6' 
  AND token = '+1taAiqt7QyHNUGsc51hwZm1R9hO35C3+K9plJIPvow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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