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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3981f70f848351f64ae15f4bc452b5d1e609cd502b19fd941a412eeeb29f1b1' 
  AND token = 'fF8z0cXpbCdD5bFh1datJ14DeDNpx0zb6RE8CUY+K/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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