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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf093dc9f8fde6c4a3ec3a0d30e189a98a90e3f2ebcef7811386f0697dd6883' 
  AND token = 'GcBIm525W9yhO+F1jtb0yP4L9gTgHIPZlV9OQ8je6Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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