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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f5477bd632bf45010b74ac58fee9922047536b48a2f7f377848a8df20ab7ad' 
  AND token = 'uk92PyUQ1WVeslkuYcj1tCoH/oRXcOeZ+2F9H9uN/bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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