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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2eda78fdeb1aea0eca0eccf696042cf4e92997dbc2ecc3964fe9c495ad72f75' 
  AND token = 'ZLe93m/pJzjkj4nsAVxwjztb4TJROi4+4Znp04uL+P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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