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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc051cacb3737f6470cbff1911193bdef67a83bc9ee05b536deb8448c97f747' 
  AND token = 'iBKifJqoCIWEJbZmraiumlUIIa3nPc2D3pkpBlSUM8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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