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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2eb6061f0b65126cb92f31325656465ffda78dac607748ad9afc1a62e55d76c' 
  AND token = 'q8dwYF2Ov+YCBKG6dCx1Lxbh5JvTzXWFeSVf7DkoXk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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