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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879ef969fd5bc46f89108788a1f0a47b28b08566ec18c20a4f12ae15a30820fd' 
  AND token = '/B87JHH8gKd+mWPXW7FTN/kMcqmAXre6ULTWZwUirBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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