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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff3719b4551c48676f8c8bd8096e0753eaa1a22981fa9bf464df813fe06a2bb' 
  AND token = '3jcrUv/HBFTb7yClY2y9wvxznexcx/edgUmey399FdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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