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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88d63ba67a99a3d3fdce6fa9f4dc2bdc72e818ddcb8e2ca1c778666ec4fb8b5' 
  AND token = 'GdOYNGFmtASHUCt1S4WzB/Gx60bEkJ9JehKN9GEFgj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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