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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dc0acb29020b5aad3bd7a548c4ed68e32c7fd7f7abfd2469a44cb707bcf65c' 
  AND token = 'PptTdsTPt9bpv6zQ2rdc5z6G/KIXzTk/Usj3Wb9EZgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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