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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26025755bae64f711e9d3aeb7ab69396160f00871634e1799e9ad4e787adda0a' 
  AND token = '6IONe9H9HnnxkMneKNiOXrhFYU4Di4HL5N7Qgg8ei5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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