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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408e952feb8c5c8df1267615057e2ecd716a7dc70a835d5be414426c37a02c98' 
  AND token = '5iLqdfDB3oeeYqDahnaQhJh51pUnfAMiSrxpmp9ixU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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