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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7be6a2e5b1837778fa39bcd0f11653562ccf8d7e438a978da91aa1e364f745' 
  AND token = 'xdC8nEmfcubW2K8wJYK71OyPUW8xM/vvsWHCYJvM07g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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