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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc90b8ccd9b348185326757afc123e8040d9000646e005ec8b170a0ac25bc039' 
  AND token = '//l0gukcRH16At/vVP8cENaT1nkRLPV33Pn82IEcsMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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