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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8027f02e7c54800bada66b0f70a3e644b86229e47a79be001c8884d9e681b9e5' 
  AND token = 'WHXK/nc+1dWqBFzRnNPeb9QuhcV8jpQ4d8GLNf1+O+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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