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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eea537e0de76366d94e521a9699eceac190bfeccc0e6f35ab8ba77d5d7593b1' 
  AND token = 'hLk7+ydw+M+z4ioAVhQeZ9Xsl6sjGe0JyWEhr9kAMzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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