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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bda3bcf8305a1c1121aed0220d360cff2c7fd638896b434a0d61ff2f64d96b' 
  AND token = '+c9rXmpKJPLDJfkeUP2uHSIYywgqYi54De09dMYruqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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