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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8325c8f0bade943be8d9ecade28234295c8ece0307b1a8f29065b0be6614875' 
  AND token = 'G6xaUPGcxgD1ktydHzokj9jTiD4KhMuEP+di5IA0w84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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