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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8bf5b80cf164b9405b7c14dbd51217d3e085f0b3935a99d43bec62f75de706' 
  AND token = 'ivT23J/0SflmN9LxwH0n+Rv2+iBNtJVV3css87594TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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