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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9ccad01c89a79a1e599d688fc5ad39c39cf24cd7a0e2554407c33d00f52e6f' 
  AND token = 'tJgakEGb8dY4SkO+1dCHA/llhRcWXfsyEqxopISrEcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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