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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8c3ea9fe01ed63b4118e585de224aa488fe790548417428009c6988dee0bfa' 
  AND token = 'cFXuT+pHCbTdlmSZQrdyjawc2AJm32FU0NeCrjwSYT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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