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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce08313b7ec24d759fc5bbcbf639d4efd64aa06a13d49ec231bd334a0a27abae' 
  AND token = 'JFHprAtY/58fuuUoNNBNtlA5nx0rRshxTflGhI1D5eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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