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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99dda54b80b1d1bf1a4344dcc22f26cd7ae028cdd789e8bf29541ce9e0a06a93' 
  AND token = '5v/Z/EGveI9JfuTV2ZtmdfPXELYz5W1VdriuQAz3/dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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