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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6430a357e4052784bc065d3038f4b9afc68a7f6c910b3878e3fc058f14b59bf9' 
  AND token = '9mfsBxWlpPqxnheYbhbST7WwjLR9A3Vs9O/KaxtYtY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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