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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c661ecc670248ba8e9ccbd48c048f4f43d5e69c851a515e02f84798d59fe20e7' 
  AND token = 'oCod8pnNUNib2Y02LeDeXYhtT2qKJkS5ZmMIvFA7kQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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