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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02ec4726285e5e4e2293931d194077fa64ed7b26b123b108061c3ccfc6fe30c' 
  AND token = 'fTNrAjutW3y4OdlCN6gRoK0vry3kXRM6fTwamTDWiew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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