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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16296ed1e730e73fba41b305495e853a8de4836edacfac3ebb2bdb59949e4d8' 
  AND token = 'oivPfmNE1Cel8tXc0alHat1CD2TIyyfsWfi0gsjBaVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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