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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8091117535e7b161c65da163da6c75c0e3353a60466bcd0c33c4fe31f5f2a286' 
  AND token = 'kmCPlpwp54PmA87ivnxvxYm2a0bdMgNs9HyZtqunApU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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