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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3d43e844c65d4c0adc6a0837ee29ebb5e9b4a1dc2aecd2bedca16c606ab712' 
  AND token = 'j9/Gb6A4co5cU4IgNCJhuzYJrK4fnc9ADBmGTOsdrgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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