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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd72294ed012f222b007367de316fb007c6441b8f82fdbefca4a5aecd3ca672c' 
  AND token = 'vjU+L4FDRHzcypmsehAfNVYyFSV0Yvo/5Gjkqjpo8Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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