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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dda43c45efaedf5156e8a2643d5802ae2e4352f77c71861ce6d22392afb76a9' 
  AND token = 'TGAVJn5G0k49oMBRcwG/D+S/I0rGPJpBWNmt4qeRKRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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