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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eee0f3c261320481174e8f0ac7c754756b9886524a9ca2ff8853465d9144bf4' 
  AND token = '3miQn49QKmvtm6qKzRyeiu4ql4zXg03SjlAFD0RUjfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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