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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff11d6ebbb3189ed253f1f19e2b3a5c66b203019652414e345bd8fafa67cf37' 
  AND token = '67xEfbAJRd8/43cgH3GfsU7X0MZlbBBNKH39w4Vn80w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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