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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3422075f922ccf5f90cd34c24b4573328799f16fd0aeec6aefbc347b001ee1b' 
  AND token = '6tn//zLTxvl3w97kGGP8G+aMivF14OMgzuBiOMrmSjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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