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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba05ecd90a02109e6e89b0dfd4efe535a18d8fb2e9ef365ec581ef5ef10af87' 
  AND token = 'eow1lKYvoRXo3AmSnNoxY8NXbMmvZeunELMCedsjNiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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