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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eabb802418167e50c89107eb5c625fa9d0c16dc71607da9df8bf23ee759fbd6' 
  AND token = '0whsY5E4NySHeB6Qp5RjFT6rLCQ5MiPgqqsHb1UdOn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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