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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2ade7983f66af7b55312eb96841050da67336696b184e37b753b48b1517fca' 
  AND token = '78BIH81nEEK7eD4efYqrjnTujfxmfZaeNnZ0+6GTwMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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