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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f273406e674467c06fc383512caaf8641a3b658ba181c969f1bb6af307c750' 
  AND token = '77aaoy6i0UZd71aK78dUkA0p+Bj9QDi70DmMjt7ngmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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