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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aed5c84f3cfa40068d7c7abbedef0dc6843adb6353deddcc948a7a75b4d537' 
  AND token = 'DAIOB3l70weNU9w3XSzFMLA8ndxKUI9IrF/4wZHolU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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